Thickness of Turkey Shell Membranes

There is very little information in the literature on thickness of shell membranes. Hays and Sumbardo (1927) working with chicken eggs reported that inner shell membranes varied from 0.0129 mm. to 0.0173 mm. and outer shell membranes varied from 0.0411 mm. to 0.0560 mm. They gave the method of preparation of membranes and how measured but did not state from what place in the egg the membranes were taken. Romanoff and Romanoff (1949) listed the thickness of the shell membranes of turkey eggs to be 0.09 mm. for the outer and 0.017 mm. for the inner shell membrane. It might be assumed that the large end of the egg was the location for taking the measurements since the membranes are normally already separated in this locality. METHOD AND MATERIALS There was no attempt made to measure the two different shell membranes. Measurements were made with micrometer calipers with a ratchet…